The natural screen (natural-v.p.a.m.) shows mathematical expressions such as roots and fractions that appear in your textbook, and this increases understanding as the results are easier to understand It has 252 functions, 24 levels of parentesis Elementary mathematics: fraction calculation, percentage calculation, prime factoring, angular dimensional dimensions, deg/ rad/ grade converions, pol ÷ rec coordinate conversion Elementary mathematics: trigonometric functions, hyperbolic functions, exponent, mathematical functions and calculations in the sexagesimal system Statistics: calculation of totals, standard deviations for clustered and ungrouped values, regression and permutation analysis (npr), combinatorial (ncr)